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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e07c0506cfde06b69453a1a1026ca2e74933849a1e73512ec486fb35b44b53' 
  AND token = 'rNNCL2jVoashXm3ded1ey95igZFpXq7iOQrPGE8F3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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