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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c520d2c01ba4217a11723c09a4298b299945e084612af56e7aa7883a6e46ed1' 
  AND token = 'B2N2i1lPlOPAwd2AS6zZmoAk7KOM2XdLPsa75tofPLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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