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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eac4e06d33e0385ff47a4ece90b539a7f827bc04a0e026cbe9d404f6a7ec7a6' 
  AND token = 'eGBt2upDblhTptRFJ+Sw1/YL1TBjcnkyMPJofdx3keY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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