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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a97c6cad879a2777e7d13797151341ba3fcf59e57e75722f385ab6bf6688e3e' 
  AND token = '7OfEd0OZpEPRU2eyz8vAczagnrjzT8FJyOZFdrm4qB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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