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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c4167a3dcce7a096949e5e9b864f340c5313260a6e93ddc0cfe79092f66515' 
  AND token = 'uhq59cw4VVkfYuBjGpFykLAuDLG30HyEmR1wGR2PHaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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