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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a9d5dccd87e219aebe26588b986e7cc060f7a27b92fdc7488ea1281c9f94e4' 
  AND token = 'TJLJXRyOLqu+bnL7fu9rbN6Tx3Cr8/976JRcAdSFAVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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