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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2abe01071f4a25f8a5dd0c1aa9e932503c654d2a083944be1babf7190bfd0c' 
  AND token = 'h4Rwi0FwuW9Buh1udcnDSW0PXrK1aWWjL2dvswa3Ayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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