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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408b4b90aafe13bcf3d4df08dbb7a2a529a21aa61409c4ff5f4de02df0fddb37' 
  AND token = '+rLxuJFWJc5S0F544TiI4t/EZAweQs5vW2cbLGBbfGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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