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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73cb61e3b0f34d93e9328246254320e7d51d6c4bc093181d40520133b947dea' 
  AND token = '8qjcKxfdXVAH+YIvTYYL9tOgiDVv/7U4MnM2dJYbR2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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