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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba5cf496c735bf6c5a905efbe1bab8161d388f5ed4f46dcc1f846d9ace33e0d' 
  AND token = 'ps1gHd34Oz03zPqPG9U4YyssvkeuT6bp/hu3XfpWBo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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