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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc60eb4a1ecea26904252a111b3b232298094eaaf74c69ccbc2e51c346ff41a' 
  AND token = 'lBsLuvRdTBONEIIxGLMl7cwoJU2F8iimPQ5B0TUX4fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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