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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210ac0ffa9677919e4c6e48bf802701e3f2b91086db9c5c0543d5c2bd2096f3a' 
  AND token = 'cBT0mk+PGeJyByytEk9hq+XSQxrN6NBEAdYsEp7r8NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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