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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e4f4bda2d8107f8d41cca444c1db68741a71fd337cf1a0c315a0e67c9d54d1' 
  AND token = '7uhSHZlTleoIg+5beA40a2X4dFgq/bALpFiKNV7YWGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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