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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02720d981e5bd3c9959c04f1f6d9a87e9dbea173736be72a374574fbb330db6b' 
  AND token = '60SIlUoVmZiA0tl8j/rO4ZnSrynw9wvp8UKjpNxGMiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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