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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae03f604bc89efca2d42d6c66fd6914429044615944927fabb395e9c598901a' 
  AND token = 'hAy0hmuyiJuaCsyTB1UFhxjV3FvWiSAtU5/nbbQ3Aos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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