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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a188f3df8f1a0bf4ceb26d1577bfc85c259e588f897bd50e7e08b92cba97d3ac' 
  AND token = 'uZGTZZHkubaUVIgS00UAA79gfHCXiUb0EgqyGiGOhGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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