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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc06d9116d3d9c2086a062fab34640130318b24aa60d6ad620abbcaa1bf601e9' 
  AND token = 'XpcXUkgLek4kdiUt/RfUcEzw9SLBbFrCy9u6XEmlF1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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