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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f6d0e5c3fa7540db0ff53bd4cf1d9c3f385552939ec54fd40a34b19787e237' 
  AND token = 'LSfF4v98yWCNZhhLF29d/pg+0gidEa+qOm1V708jqxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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