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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25da879674e53d7294ebcb1a4d95c128b2c8c577111198ac8ced43005310520d' 
  AND token = 'oZVpfnHKtjhbT1YrTjPowNbLj1cviJ7QtPfSaB2okvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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