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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36085048ce97cfcf934b4de1ba936e878a1eff42b72442e6bbf24171857fb625' 
  AND token = 'U4fBfCLJsCSdVSt4jnaivcXq9XzJ8tCDgV1tMZICdrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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