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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8175220d810b486ae5c780fe1e69ecf241ec1a1b04bcc40c3ad006988f6079e3' 
  AND token = 'rdEHykNMmFYP1RhjpVvMGxPG1GaHPvR55PEUNnsjF4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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