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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b92b74cc3c8263f0b765256eabd575ed2cacd843dcbb89660bcf2a77476743' 
  AND token = 'Annv+x+AJ2Bqzqbb2z8fbRDctFORxQvXP0FNmAhqi8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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