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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969b3fedb89a5524a890d5640ae0b7fb5276f305876260e3e698aedd89750473' 
  AND token = '22Q0kg400flGP8l1OBOMDbu+98X1+7tfMX2yg7KY8lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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