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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b3704a8fe5e726bb9137c10d3e9ac278838d7428c7e0bba7ccb8e65f44649e' 
  AND token = 'wKAg3o9fuf4qPjmRSZXAehaafJzmecFA/Rj4hXaaumY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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