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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6ffce89510ad93d05bf8d3f436b2a665473ea19ce704c8b5ee5194acabfd9f' 
  AND token = 'ZlFeW+qLs1jXjT75hv0TCeFTgC3z6YPX1D1FhpAY4vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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