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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593761b4d72971ef90d6949aa9a7a0113fd4de1785e99af7d4ea59e3c19b3477' 
  AND token = 'vp3pbg7+s5ur1u8sJSqH8mSZ+78E35JnxQqczuvFFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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