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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b955e9719a055781994b112f8f53b337e3ba3c5ea68cc5ad1355edbb1890c7f9' 
  AND token = 'wYZDZwctb3O0lJKa+vSCQYX5p5KebYk7FZTdwlqxilE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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