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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b8fdc1a58c2c62e7956eca0543d38ee1b0afdaffd3be7e02b4bac2c0b67c47' 
  AND token = 'cBc8DJamU2nMiN7S4fwnWzXyjZ+/rBuwIR6Z3WqPcW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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