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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cfd0a0dfb8e84eb846818e8dd0abbffeea5aa7f509f94893cb030cf056a89a' 
  AND token = 'xh90TVzIQ2JTU2TAqAV3XSIk26/cGLs9tddTTjbA3us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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