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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bddf629ef67ffa3737fe142c44ada47943476b3853abe1fa3a436094130c163' 
  AND token = 'TUPcNHqbJBrf4+kS7AasqQpH9Qvh1JxjZOTpzWh0peg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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