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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb91ab88d728f2b597608e7cd4b25026a3ed8e661aa52a469286d534e2db9fd' 
  AND token = 'nPKZ6N+EB7sqrr6dyHnnxloZojSkQ5IBgSHEMBftVEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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