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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35482c6df2e522840237d68f1ce0e6bf83460b2364136b27681082519130919a' 
  AND token = '78KIsGSmzCmwfpKNqo19gJ81Xnl5hcrb3VhgHuX3DG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}