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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91f9a06526ba503765fcc03167f6bd9d1a08952c3ee8804e10c6786808b6d58' 
  AND token = 'At+wuXSxiOU1SLDrzafEi7ubyeCxd6bJTqzdCJ8lc18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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