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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434baf3a1252256e2963d9fc801354eecceb8ff095d84515245c112c6cd06515' 
  AND token = 'fuUrFwyLiS1UrIgobnvlIgiVT3APFUhSjeF/pQSZbqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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