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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8262a0f8601301e0362a8026a3c07ffd04bef7c245c57186758e8bf1384623e8' 
  AND token = 'o6ZZ6MKvjni+CNmx41Q4b/B5r8OirIO/L0cfyc40fps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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