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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5950142c8fd271165bfff0ac3e0f7f5a7e08c03b45737715697164b33572a7ce' 
  AND token = '36HOtvobkmdTRWp9HJtkNovemGUtXgjz0DcwH/s+qnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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