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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56c498d9c6187c610b4da894a49c3cde23f53f823c3d3b2ae4cf6664ec1da88' 
  AND token = '8X64dZA4aHzW1bPMOR8bCBxJ1DHDcH3d+yR/h3rrjt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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