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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd153ff9b58be0c71582b1c09902aa1dec78db9057e437eb174caf49203a3f814' 
  AND token = 'kb/cllG3nkv9+HTtys3FlV51fYVEHw66UzBBVuD0j7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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