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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7586b286411423f1e8d5d5f74818f6d3fb7dae55468dd9643f71cfa44224d9f' 
  AND token = '7QICNdZkBFMcjk3KzKQaRviubarv+2J7mMU3NNZ2y2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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