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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6a5ca0329a51190a5731063f2b359470a4df5d05ff3a7429fba8a7fa1239c0' 
  AND token = 'o0vD6725t9rEoDianG1I86tvnY2j7CcMLfZ5QJvWqDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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