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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcac5ce25b20245ef5fce46269dc21d4fc1032ba5e0430ee3e9faf50fc5de61' 
  AND token = 'vmE2zBih5HfdGi4RN3OXMXg+uUKrSFmhDO7HlJWM7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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