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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833acf2aecf408c00f798a70ec139c3fec337983235e6b6afa61e972793021e3' 
  AND token = 'VYnNeFOPtfOYCzDSg50acT3aLHRjjc1+EcyVpYv2A40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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