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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4881725ea1f5b33c0ed63f04bf9fa9ca715ce7aced1e0f39f143adb5708f0a' 
  AND token = '+yPr8niIDvPFibWEyyGTk/9FR3DGtzXyltcJ4227tbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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