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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a19f919f6ef56cc6fb29d89c8c98b572e8cf6e563e2ed8988fa4fa0b94af8f3' 
  AND token = 'XcX4aPbxto0mmYWJfiOo1wpWWb1D/absbBq34t7zCV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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