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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4305cbcff812ec07272e6eb92e231e18509a50d2c4f311704dc5722d5a7b32' 
  AND token = '+nSlIseWlQBc6zlffXk/6CjzO1TKK03lRlin7XPFd/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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