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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da69b0341c6755b120fd15440d1a4eb144832dc32f2ff9d65ce80a4749cad93b' 
  AND token = '8zxCrxMER84SLJXxOoRyfM76qlzRBm5NsoWP+fhz0Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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